July 2010
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSA5147 • FSA4157A Rev. 1.0.6
FSA4157, FSA4157A — Low-Voltage, 1Ω SPDT Analog Switch
FSA4157, FSA4157A
Low-Voltage, 1Ω SPDT Analog Switch
Features
FSA4157A Features Lower ICC when the S Input is
Lower Than VCC
Maximum 1.15Ω On Resistance (RON) at 4.5V VCC
0.3Ω Maximum RON Flatness at 4.5V VCC
Space-Saving 6-lead, MicroPak™ and
SC70 6 Packages
Broad VCC Operating Range:
– FSA4157: 1.65V to 5.5V
– FSA4157A: 2.7V to 5.5V
Fast Turn-On and Turn-Off Time
Break-Before-Make Enable Circuitry
Over-Voltage Tolerant TTL-Compatible Control
Circuitry
Description
FSA4157 and FSA4157A are high performance Single
Pole/Double Throw (SPDT) analog switches. Both
devices feature ultra low RON of 1.15Ω maximum at
4.5V VCC and operates over the wide VCC range of
1.65V to 5.5V for FSA4157, and 2.7V to 5.5V for
FSA4157A. The device is fabricated with sub-micron
CMOS technology to achieve fast switching speeds and
is designed for break-before-make operation. The
select input is TTL level compatible.
The FSA4157A features very low quiescent current
even when the control voltage is lower than the VCC
supply. This feature services the mobile handset
applications very well allowing for the direct interface
with baseband processor general purpose I/Os.
Technology Description
The Fairchild Switch family derives from and embodies
Fairchild’s proven switch technology used for several
years in its 74LVXL384 (FST3384) bus switch product.
Ordering Information
Part Number Top
Mark Package Description Packing Method
FSA4157P6X A57 6-Lead SC70, EIAJ SC88, 1.25mm Wide 3000 Units Tape and Reel
FSA4157L6X EG 6-Lead MicroPak,™ 1.0mm Wide 5000 Units Tape and Reel
FSA4157FHX EG 6-Lead, MicroPak2™, 1x1mm Body, .35mm Pitch 5000 Units Tape and Reel
FSA4157AP6X B57 6-Lead SC70, EIAJ SC88, 1.25mm Wide 3000 Units Tape and Reel
FSA4157AL6X EU 6-Lead MicroPak™, 1.0mm Wide 5000 Units Tape and Reel
FSA4157AFHX EU 6-Lead, MicroPak2™, 1x1mm Body, .35mm Pitch 5000 Units Tape and Reel